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Collection generics method types

 
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Hi, How to call the following 3 methods in Collection generics. These look typical and hard to understand.
 
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Where did you get these methods? I think the last one is illegal.
 
Harikrishna Gorrepati
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Thanks Stephan. I am clear now. These are some samples that I got from net.
 
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Why is the third one illegal?
 
Stephan van Hulst
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Hmmm I tried the third method, and it compiled just fine. I have no clue how to call it though. It looks like a circular reference, so I assumed the compiled wouldn't allow it.

If someone knows, please give an example.
 
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The third one can be called like this:
 
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